lrp cpx 30 to ride 32
 

When I change the tyres from cpx 30 to ride 32, the car gets higher.
What I need to do with my downstops?

For example, front is 6mm downstops, does it need to be increased like 7mm, or decreased like 5mm?

When I change the tyres without changing downstops the car isnt very directive anymore and response is slow.

You need to adjust the downstop to a higher number by the same amount that the ride height changed.
e.g. ride height changes 5mm --> 5.5mm
downstop change form 6mm --> 6.5mm

Then you change the ride height back to what it was.

The thing is that a different tyre is more than likely to need a different setup anyway so it's not all that important really.